e. A and B are two trains of lengths 240 m and 120 m respectively. They are running on
parallel tracks at the speed of 54 km/hr and 36 km/hr respectively in the same direction.
In how much time will A pass B completely from the moment they meet?
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2
Answer:
Two trains 130 m and 140 m long are running on parallel tracks in the same direction with a speed of 68 km/hr and 50 km/hr.
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Solution:
Relative speed of trains = (240 – 120) km/hr
= 18 km/hr
= 18 × 5/18 m/sec
= 5 m/sec
Time taken by the train to clear off each other = sum of length of trains/relative speed of trains
= (130 + 140)/5 sec
= 270/5 sec
= 54 sec
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